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Our welding procedures require a welding travel speed of 6-18 inches per minute. Given that a 42" pipe has a circumfrence of 132 inches (Pi x D), not counting grinding and rod replacement, etc. it would take 22 minutes per pass at 6 IPM. Given the wall thickness. it will probably take 5 passes, which would equate to 2.5 hours. I tend to think it would take closer to 4 given the real world situation of a bore pipe and all that is associated with that kind of work.
If you get to MIG after your root and hot pass, you could probably do it in 3.